To understand 00278.7z.002 , we need to break it down into its components:

A powerful compression tool that handles split 7z files perfectly.

To extract the content, you need all the parts ( .001 , .002 , .003 , etc.) in the same folder. Step 1: Collect All Parts

Because 00278.7z.002 is only a part of the whole, It is useless on its own.

7-Zip will automatically recognize that it is a split archive and ask the other parts ( .002 , etc.) to combine to extract the final data. Step 3: Alternative Tools